Use after free in CSS in Google Chrome prior to 84.0.4147.105 allowed a remote attacker to potentially exploit heap corruption via a crafte…

published 2020-09-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27688

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

Use after free in CSS in Google Chrome prior to 84.0.4147.105 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Patch / fix

fixed in 1 distros 4

Google Chrome 84.0.4147.105

debian ubuntu red hat opensuse

chromium Debian 14, Debian 13, Debian 12 87.0.4280.88-0.1

debian advisories DEBIAN-CVE-2020-6539

chromium-browser Ubuntu 16.04 LTS 84.0.4147.105-0ubuntu0.16.04.1
chromium-browser Ubuntu 18.04 LTS 84.0.4147.105-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2020-6539

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

chromium-browser RHEL 6 EXTRAS 84.0.4147.105-2.el6_10

red hat advisories RHSA-2020:3377

chromium openSUSE Tumbleweed 93.0.4577.82-1.1
chromium openSUSE Tumbleweed 113.0.5672.92-1.1
opera openSUSE Leap 15.2 NonFree 70.0.3728.133-lp152.2.15.1
opera openSUSE Leap 15.1 NonFree 70.0.3728.133-lp151.2.27.1
chromium Package Hub 15 SP2 84.0.4147.105-bp152.2.10.1
chromium Package Hub 15 SP1 84.0.4147.105-bp151.3.97.1
chromium openSUSE Leap 15.2, openSUSE Leap 15.1 84.0.4147.105-lp152.2.9.1

opensuse advisories openSUSE-SU-2024:10681-1 openSUSE-SU-2024:12948-1 openSUSE-SU-2020:1324-1 openSUSE-SU-2020:1320-1 openSUSE-SU-2020:1181-1 openSUSE-SU-2020:1161-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-6539 updated 2026-06-28 cvss 8.8

chromium-browser: Use after free in CSS

Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 84.0.4147.105-2.el6_10 Red Hat Enterprise Linux HPC Node Supplementary (v. 6) chromium-browser 84.0.4147.105-2.el6_10 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 84.0.4147.105-2.el6_10 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 84.0.4147.105-2.el6_10
fixed: vendor fix RHSA-2020:3377

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.12% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Google Chrome

Classification

Weakness

CWE-416 Use After Free
CWE-787 Out-of-bounds Write

Technology feeds

Google Chrome rss critical rss

References

lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/EE7XWIZBME7JAY7N6CGPET4CLNHHEIVT/
vendor-advisory
debian.org /security/2021/dsa-4824
vendor-advisory, third-party-advisory
chromereleases.googleblog.com /2020/07/stable-channel-update-for-desktop_27.html
release-notes, vendor-advisory
crbug.com /1105635
permissions-required, vendor-advisory

Sources

CVE List CVE-2020-6539
NVD CVE-2020-6539

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary